A penny is dropped from the 82nd Floor Observatory of the Empire State Building. The penny will fall for 8.1s before hitting the
1 answer:
Answer:
<em>vf=79.38 m/s</em>
<em>y= 321.5 m</em>
Explanation:
<u>Free Fall Motion</u>
A free-falling object falls under the exclusive influence of gravity. Free-falling objects do not encounter air resistance.
If an object is dropped from rest in a free-falling motion, it falls with a constant acceleration called the acceleration of gravity, which value is .
The final velocity of a free-falling object after a time t is given by:
vf=g.t
The distance traveled by a dropped object is:
1.
The penny will fall for t=8.1 s before hitting the ground, thus the height from which it was dropped is:
y= 321.5 m
2.
The final velocity is:
vf=79.38 m/s
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Answer:
v₃ = 3.33 [m/s]
Explanation:
This problem can be easily solved using the principle of linear momentum conservation. Which tells us that momentum is preserved before and after the collision.
In this way, we can propose the following equation in which everything that happens before the collision will be located to the left of the equal sign and on the right the moment after the collision.
where:
m₁ = mass of the car = 1000 [kg]
v₁ = velocity of the car = 10 [m/s]
m₂ = mass of the truck = 2000 [kg]
v₂ = velocity of the truck = 0 (stationary)
v₃ = velocity of the two vehicles after the collision [m/s].
Now replacing:
Answer:
Explanation:
Given
height of grand canyon is
Rock is dropped i.e. initial velocity is zero
Using Equation of motion
h=height
u=initial velocity
a=acceleration
t=time
here a=acceleration due to gravity